August

2011

 * August 15, 2011 - Hatsune Mia is introduced
 * August 27, 2011 - Type-M Gumi is introduced

2008

 * August 29, 2008 - Sakerune Meiko is introduced

Misc

 * August 13, 0000 - Birthdate of Shirumi Kishin
 * August 17, 0000 - Birthdate of Hono Ryune
 * August 31, 1995 - Birthdate of Hatsune Mia